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What is the formula of the mean diameter at the position of centre of gravity?

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What is the formula of the mean diameter at the position of centre of gravity?

(a) mean diameter at the position of centre of gravity = Inner diameter + diameter of stator wires

(b) mean diameter at the position of centre of gravity = Inner diameter * diameter of stator wires

(c) mean diameter at the position of centre of gravity = Inner diameter / diameter of stator wires

(d) mean diameter at the position of centre of gravity = Inner diameter – diameter of stator wires

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This interesting question is from Bracing of Rotor Windings in chapter Aspects of Design of Mechanical Parts of Design of Electrical Machines

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The correct choice is (d) mean diameter at the position of centre of gravity = Inner diameter – diameter of stator wires

Best explanation: The inner diameter and the diameter of the stator wires is first calculated. Then on substitution gives the mean diameter at the position of centre of gravity.

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